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// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.apache.doris.resource.computegroup;

import org.apache.doris.catalog.Env;
import org.apache.doris.cloud.system.CloudSystemInfoService;
import org.apache.doris.common.Config;
import org.apache.doris.common.Pair;
import org.apache.doris.common.UserException;
import org.apache.doris.qe.ConnectContext;
import org.apache.doris.resource.Tag;
import org.apache.doris.system.Backend;
import org.apache.doris.system.SystemInfoService;

import com.google.common.collect.Sets;
import org.apache.commons.lang3.StringUtils;

import java.util.Set;

public class ComputeGroupMgr {

    private SystemInfoService systemInfoService;

    public ComputeGroupMgr(SystemInfoService systemInfoService) {
        this.systemInfoService = systemInfoService;
    }

    public static String computeGroupNotFoundPromptMsg(String physicalClusterName) {
        StringBuilder sb = new StringBuilder();
        Pair<String, String> computeGroupInfos = ConnectContext.computeGroupFromHintMsg();
        sb.append(" Unable to find the compute group: ");
        sb.append("<");
        if (physicalClusterName == null) {
            sb.append(computeGroupInfos.first);
        } else {
            sb.append(physicalClusterName);
        }
        sb.append(">");
        sb.append(". Please check if the compute group has been deleted. how this compute group is selected: ");
        sb.append(computeGroupInfos.second);
        return sb.toString();
    }

    public ComputeGroup getComputeGroupByName(String name) throws UserException {
        if (Config.isCloudMode()) {
            CloudSystemInfoService cloudSystemInfoService = (CloudSystemInfoService) systemInfoService;
            String physicalClusterName = ((CloudSystemInfoService) Env.getCurrentSystemInfo())
                    .getPhysicalCluster(name);
            String clusterId = cloudSystemInfoService.getCloudClusterIdByName(physicalClusterName);
            if (StringUtils.isEmpty(clusterId)) {
                String computeGroupHints = ComputeGroupMgr.computeGroupNotFoundPromptMsg(physicalClusterName);
                throw new UserException(computeGroupHints);
            }
            return new CloudComputeGroup(clusterId, physicalClusterName, cloudSystemInfoService);
        } else {
            return new ComputeGroup(name, name, systemInfoService);
        }
    }

    public ComputeGroup getComputeGroup(Set<Tag> rgTags) {
        Set<String> tagStrSet = Sets.newHashSet();
        for (Tag tag : rgTags) {
            tagStrSet.add(tag.value);
        }
        return new MergedComputeGroup(String.join(",", tagStrSet), tagStrSet, systemInfoService);
    }

    // to be compatible with resource tag's logic, if root/admin user not specify a resource tag,
    // which means return all backends.
    public ComputeGroup getAllBackendComputeGroup() {
        return new AllBackendComputeGroup(systemInfoService);
    }

    public Set<String> getAllComputeGroupIds() {
        Set<String> ret = Sets.newHashSet();
        for (Backend backend : systemInfoService.getAllClusterBackendsNoException().values()) {
            ret.add(backend.getComputeGroup());
        }
        return ret;
    }

}
